<template>
	<div class="todo-header">
		<input @keyup.enter="addT" type="text" placeholder="请输入你的任务名称，按回车键确认"/>
	</div>
</template>

<script>
	export default {
		name:'Header',
		methods:{
			addT(e){
				//获取用户输入
				const {target:{value:title}} = e
				//校验数据
				if(!title) return alert('输入不能为空')
				//生成todo对象
				const todoObj ={id:Date.now(),title,done:false}
				//触发App绑定的add-todo事件
				this.$emit('add-todo',todoObj)
				//清空
				e.target.value = ''
			}
		},
		beforeDestroy(){
			this.$off('add-todo')
		}
	}
</script>

<style scoped>
	/*header*/
	.todo-header input {
		width: 560px;
		height: 28px;
		font-size: 14px;
		border: 1px solid #ccc;
		border-radius: 4px;
		padding: 4px 7px;
	}

	.todo-header input:focus {
		outline: none;
		border-color: rgba(82, 168, 236, 0.8);
		box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
	}
</style>